KR101568189B1 - Method for actuating valve for improving fuel efficiency in coasting and apparatus for controlling valve - Google Patents

Method for actuating valve for improving fuel efficiency in coasting and apparatus for controlling valve Download PDF

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Publication number
KR101568189B1
KR101568189B1 KR1020150120814A KR20150120814A KR101568189B1 KR 101568189 B1 KR101568189 B1 KR 101568189B1 KR 1020150120814 A KR1020150120814 A KR 1020150120814A KR 20150120814 A KR20150120814 A KR 20150120814A KR 101568189 B1 KR101568189 B1 KR 101568189B1
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South Korea
Prior art keywords
valve
oil
stroke
intake
exhaust
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KR1020150120814A
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Korean (ko)
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강석진
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강석진
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/08—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing for rendering engine inoperative or idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/04—Timing control at idling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Disclosed are a mechanism for improving fuel efficiency by removing compressed air in an engine combustion chamber when a vehicle is coasting, a method for actuating a valve to realize the same, and an apparatus for controlling a valve. The method for actuating a valve for coasting in a coasting mode in which fuel supplied to an engine is blocked to drive a vehicle by inertia alone after an ordinary driving mode in which power is generated by combustion of the engine comprises: a suction stroke wherein a piston of the engine is lowered to a bottom dead point by inertia generated during the ordinary driving mode, a suction valve is opened, and the fuel is not supplied into a cylinder; a compression stroke wherein the piston is moved from the bottom dead point to a top dead point, and an exhaust valve is opened; an expansion stroke wherein the piston is lowered back to the bottom dead point by inertia, and the suction valve is opened; and an exhaust stroke wherein the piston is moved from the bottom dead point to the top dead point, and the exhaust valve is opened.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a valve operating method and a valve control apparatus for improving fuel economy in a non-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mechanism capable of improving fuel economy by preventing a compression pressure and a negative pressure from being formed inside a cylinder of an engine during traveling of an automobile, and a method and apparatus for operating an intake and exhaust valve of an engine.

A valve mechanism applied to an automobile engine supplies air or a mixed gas of fuel and air to the combustion chamber according to the stroke of the engine and discharges the combustion gas. In recent years, variable valve mechanisms have been developed that optimize the air or mixed gas inflow amount and the combustion gas discharge efficiency by varying the valve opening rate and opening / closing timing depending on the operating conditions of the engine, that is, the rotational speed and load of the engine. By improving the valve mechanisms of the automobile engine as described above, it is possible to improve the engine performance such as fuel consumption, torque, and output of the engine.

An internal combustion engine of an automobile has a stroke of intake-compression-expansion (explosion) -exhaust, ignites fuel at the end of a compression stroke, and obtains power by the expansion movement of heat energy. In the case where the vehicle is driven by power, the inside of the cylinder (combustion chamber) must be sealed so that the expansion pressure can be efficiently converted into the power. However, in a case where the vehicle is running under a condition (coasting) , The engine resistance should be minimized so as to travel as much as possible to maximize the fuel economy of the engine. However, in a conventional engine, a compression pressure is always generated in a cylinder (combustion chamber) in both of a general running state in which power is generated and a case in which the vehicle is running in a non-driving manner. Therefore, under the other running conditions, the compression pressure inside the cylinder acts as engine resistance, which causes a disadvantage that the fuel consumption is lowered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a valve operating method and a valve control apparatus capable of reducing the engine resistance under the condition of the running condition of the automobile. It is another object of the present invention to provide a valve operating method and a valve control apparatus capable of improving fuel economy and increasing a travel distance by vehicle inertia in the case of a traveling condition of an automobile. Still another object of the present invention is to provide a valve operating method and a valve control apparatus capable of improving the cooling efficiency of the engine.

In order to accomplish the above object, the present invention is characterized in that, in a normal running mode in which power is generated by combustion of fuel, the fuel supply to the engine is cut off and the vehicle runs only with inertia of the vehicle, An intake stroke which is lowered to the bottom dead center due to inertia generated in the normal running mode and in which the intake valve is opened but the fuel is not supplied into the cylinder; A compression stroke in which the piston moves from the bottom dead center to the top dead center and the exhaust valve is open; An expansion stroke in which the piston descends again to the bottom dead point by inertia and the intake valve is opened; And an exhaust stroke in which the piston moves from the bottom dead center to the top dead center and the exhaust valve is open.

The present invention also provides an upper split bar slidable in a vertical direction; A lower split bar located below the upper split bar and slidable in the up and down direction and defining an oil receiving portion between the upper split bar; A main body in which the upper split bar and the lower split bar are slidably received, and an oil supply gallery for supplying oil to the oil receiving portion is formed at one end; An oil chamber for supplying oil to the oil supply gallery; A valve for supplying oil to the oil receiving portion through the oil supply gallery or for discharging oil from the oil receiving portion; A cam mounted on a lower portion of the lower split bar to periodically move the upper split and lower split bars; And a rocker arm that is driven by the up and down movement of the upper split bar to control opening and closing of the intake or exhaust valve.

According to the valve operation method and the valve control apparatus of the automobile engine according to the present invention, the fuel consumption can be improved by reducing the engine resistance under the other running conditions, and it is possible not only to increase the running distance by the vehicle inertia, Can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example of an automotive engine valve structure in which a valve operating method according to the present invention can be implemented; FIG.
2 is a graph showing a valve locus and a piston locus with respect to crank angle for each stroke in the normal travel mode (A) and the other travel mode (B).
FIGS. 3 and 4 are a side view and a plan view, respectively, of a valve control apparatus for on-off travel according to an embodiment of the present invention;
5 is a view showing an operating state of a three-way solenoid valve that can be used in a valve control apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an example of an automobile engine valve structure in which a valve operating method according to the present invention can be implemented. As shown in Fig. 1, an automobile engine includes a cylinder 102, in which a piston 104 reciprocates up and down. At least one intake valve 106 and at least one exhaust valve 108 are located on the upper side of the cylinder 102. The intake valve 106 and the exhaust valve 108 are respectively connected to the intake gas passage 110 and the exhaust gas Is opened or closed to provide communication with passageway (112). The intake valve 106 and the exhaust valve 108 are driven by a valve control device, which may be a mechanical, hydraulic, hydraulic-mechanical, electromagnetic or other type of system. The valve control apparatus can operate the intake valve 106 and the exhaust valve 108 to generate engine valve events such as main intake, main exhaust, engine braking, exhaust gas recirculation, and the like.

2 is a graph showing the valve locus and the piston locus for the crank angle for each stroke in the normal travel mode (A) and the other travel mode (B). The piston 104 is lowered to the bottom dead center in the intake stroke, the intake valve 106 is opened, and the intake valve 106 is opened, as shown in Fig. 2A, A mixed gas of fuel and air flows into the cylinder 102. In the case of the GDI gasoline engine or the diesel engine, only the external air is introduced, and then the intake valve 106 Closed. In the next compression stroke, the piston 104 moves from the bottom dead center to the top dead point, compressing the air or the mixed gas of fuel and air inside the cylinder 102, and igniting the fuel immediately before the end of the compression stroke In the case of a diesel engine, the fuel is ignited by compression ignition or the like of the light oil by the spark plug), and the fuel is expanded. In the expansion stroke, an engine driving force is generated while the piston 104 is pushed to the bottom dead point by the expansion force of the fuel. Finally, in the exhaust stroke, the piston 104 is moved from the bottom dead center to the top dead center, and the exhaust valve 108 is opened to discharge the combustion gas inside the cylinder 102 through the exhaust valve 108. In the normal running mode (A), the above-described intake, compression, expansion and exhaust processes are repeated so that the engine burns the fuel and rotates the crank coupled to the piston 104, thereby generating power to drive the automobile.

When the fuel supply to the engine is interrupted after the normal driving mode (A) in which power is generated by the combustion of the fuel, the automobile is driven in the other traveling mode (B) do. 2B, in the engine drive of the other running mode (B), in the intake stroke, the piston 104 descends to the bottom dead point due to inertia generated in the normal running mode (A) The intake valve 106 is opened to smoothly lower the fuel injection valve 104, but fuel is not supplied into the cylinder because the fuel supply is blocked. At this time, if the intake valve 106 is closed, it is difficult for the piston 104 to smoothly descend due to the pressure drop (the inside of the cylinder 102 becomes a negative pressure state). In the next compression stroke, the piston 104 moves from the bottom dead center to the top dead center, at which time the exhaust valve 108 is open. Thus, when the exhaust valve 108 is opened, the air in the cylinder is exhausted through the exhaust valve 108, so that the compression pressure of the air is not generated. Therefore, the piston 104, Can move to the top dead center in the state where only mechanical friction with the wall 102 exists. In the next expansion stroke, the piston 104 descends again to the bottom dead point due to inertia generated in the normal running mode (A), at which time the intake valve 106 is opened. In the expansion stroke, fuel supply is shut off and the intake valve 106 is opened, so that the interior of the cylinder is maintained at atmospheric pressure (constant pressure), and the piston 104 can smoothly descend. Finally, in the exhaust stroke, since the piston 104 is moved from the bottom dead center to the top dead center and the exhaust valve 108 is opened, no compression pressure of air in the cylinder 102 is generated and only mechanical friction with the cylinder wall The piston 104 moves to the top dead center.

In the valve operating method for the two-way traveling according to the present invention, that is, in the engine driving method, the intake valve 106 is opened in the intake stroke and the expansion stroke, the exhaust valve 108 is opened in the compression stroke and the exhaust stroke, Is rotated only by the loss of the degree of mechanical friction, so that the inertial force of the vehicle can be maintained to the maximum, and the vehicle can travel for a longer distance. In other words, in a conventional engine, the air in the cylinder 102 is compressed during the travel of the other cylinder, so that a braking effect by the resistance is generated and the fuel consumption is deteriorated (the compression energy becomes larger in the engine with a higher compression ratio, The distance traveled by the vehicle inertia is shortened). In the present invention, in the case of traveling in a non-driving manner requiring no power, air is not compressed within the cylinder 102. [ In addition, according to the present invention, when the expansion valve is opened, the intake valve 106 is opened to introduce cold air from the outside into the high-temperature cylinder, and the exhaust valve 108 is opened during the compression stroke to cool the high- It is possible to obtain an additional effect of improving the cooling performance of the engine.

As shown in Fig. 2A, the opening and closing of the exhaust valve 108 in the exhaust stroke and the opening and closing of the intake valve 106 in the intake stroke are made continuously. That is, after the exhaust valve 108 and the intake valve 106 are gradually opened during the first half of the exhaust and intake strokes, the exhaust valve 108 and the intake valve 106 are gradually closed Which is indicated by a curved trajectory in Fig. On the other hand, in the present invention, as shown in Fig. 2B, the opening and closing of the exhaust valve 108 in the compression stroke and the opening and closing of the intake valve 106 in the expansion stroke are discontinuous desirable. That is, after the exhaust valve 108 and the intake valve 106 are momentarily opened at the start of the compression and expansion stroke, they remain open during the compression and expansion stroke, and are instantaneously closed at the end of the compression and expansion stroke , It is possible to more completely reduce the air resistance to the piston 104, which is indicated by a linear trajectory in Fig. 2B.

The valve operating method according to the present invention is a method for operating a valve in which the vehicle is running in a different running region, that is, the fuel non-spraying region in which the accelerator pedal is not depressed (set in the fuel system of all the vehicles) (I.e., the engine rotates at a constant speed or more). For example, if a driver runs a vehicle at a constant speed and then continues to travel without any further speed, if the vehicle can continue to travel on a downhill condition with a gentle downhill slope, In the case where the clutch is driven by releasing the accelerator pedal (in this case, the travel time is short, but the effect is large due to the large frequency), when the vehicle is stopped after traveling at a predetermined distance due to a forward stop signal, The method of the present invention can be usefully applied.

3 and 4 are a side view and a plan view, respectively, of a valve control apparatus for on-off travel according to an embodiment of the present invention. 3 and 4, the valve control apparatus according to the present invention includes: an upper split bar 30 slidable in a vertical direction; A lower split bar 32 located below the upper split bar 30 and slidable in the up and down direction and forming an oil receiving portion 24 between the upper split bar 30 and the upper split bar 30; An oil supply gallery 22 for supplying the oil to the oil receiving portion 24 is formed at one end to receive the upper split bar 30 and the lower split bar 32 so as to be slidable And a body 10 (body). A protrusion 30a is formed on the lower portion of the upper split bar 30 and / or on the upper portion of the lower split bar 32 so that the upper split bar 30 and the lower split bar 32 The oil receiving portion 24 can be formed in the space between the upper split bar 30 and the lower split bar 32. [ When the oil storage portion 24 is supplied with oil and the size of the oil receiving portion 24 is increased, the upper split bar 30 is moved upward to drive the rocker arm 40 . A safety oil drain gallery 26 for discharging the oil in the oil accommodating portion 24 may be installed on the other side of the main body 10 when the size of the oil accommodating portion 24 is greater than a predetermined size. It is preferably formed at one end. The safety oil discharge gallery 26 prevents the upper split bar 30 from rising beyond a predetermined distance so that the piston 104 and the valve 108 collide with each other due to an excessive rise of the rocker arm 40 .

The valve control device of the present invention further includes an oil chamber (20) for supplying oil to the oil supply gallery (22); A valve 12 for supplying oil to the oil receiving portion 24 through the oil supply gallery 22 or discharging oil from the oil receiving portion 24; A cam 50 mounted on the lower portion of the lower split bar 32 for periodically moving the upper split bar 30 and the lower split bar 32 up and down; And a rocker arm 40 which is driven by the up and down movement of the upper split bar 30 and driven by the principle of leverage to control opening and closing of the intake or exhaust valves 106 and 108 . 5, the valve 12 supplies oil from the oil chamber 20 to the oil receiving portion 24 ("ON" state) or from the oil receiving portion 24 to the outside, for example, Way solenoid valve which is capable of discharging oil to the cylinder head ("OFF" state). The cam 50 opens and closes the exhaust valve 108 and the intake valve 106 in the intake stroke and the exhaust stroke and the valve 12 opens and closes the exhaust valve 108 and the intake valve 106 in the compression stroke and the expansion stroke, Respectively. Therefore, the cam 50 is operated both during normal travel and during another travel, and the opening and closing of the exhaust valve 108 and the intake valve 106 are continuously performed, And the opening and closing of the exhaust valve 108 and the intake valve 106 are caused to occur discontinuously (see Fig. 2). Normally, when the cam 50 rotates once, the crank of the engine rotates twice. In Fig. 4, reference numeral 62 denotes a cam bed, 64 denotes a hydraulic regulating valve, and 66 denotes an electronic oil pump.

Next, with reference to Figs. 3 and 4, according to the present invention, in the another running mode, the intake valve 108 is opened during the compression stroke to discharge the sucked air to the exhaust without compression, And introducing outside air into the cylinder will be described. First, when ① opening the exhaust or intake valve 3-way solenoid valve 10 by turning on (turning 90 degrees) at the start of compression or expansion stroke, and ② opening it to a predetermined pressure (for example, about 5.0 bar) The oil in the oil chamber 20 being retained flows into the oil receiving portion 24 through the oil supply gallery 22. [ The upper split bar 30 is pushed upward by the oil that has flowed into the oil receiving portion 24 and the upper split bar 30 is pushed up to raise the one end of the rocker arm 40, The exhaust valve 108 or the intake valve 106 coupled to the other end of the cylinder 102 is opened so that air is discharged from the cylinder 102 or air is introduced into the cylinder 102. [ (5) Meanwhile, when the bottom surface of the upper split bar 30 reaches the safety oil drain gallery 26, the working oil is discharged through the safety oil discharge gallery 26. Next, when the 3-way solenoid valve 10 is turned off (rotated 90 degrees to the initial state) before the compression or expansion stroke is completed, Direction solenoid valve 10 and the oil drain gallery 28. One end of the upper split bar 30 and one end of the rocker arm 40 descend And returns the exhaust valve 108 or the intake valve 106 coupled to the other end of the rocker arm 40 to a closed state. (9) In the intake and exhaust strokes, the cam 50 simultaneously drives the upper split bar 30 and the lower split bar 32 to open and close the exhaust valve 108 or the intake valve 106.

According to the valve operating method and the valve control apparatus according to the present invention, since the air is further introduced and discharged in the compression stroke and the expansion stroke at the time of traveling in the other direction, the engine resistance is reduced, the fuel consumption rate is reduced, .

Claims (7)

In a different running mode in which the fuel supply to the engine is interrupted after the normal running mode in which the power is generated by the combustion of the fuel and the vehicle runs only with inertia of the vehicle,
An intake stroke in which the piston of the engine is lowered to the bottom dead point due to the inertia generated in the normal running mode and the intake valve is opened but the fuel is not supplied into the cylinder;
A compression stroke in which the piston moves from the bottom dead center to the top dead center and the exhaust valve is open;
An expansion stroke in which the piston descends again to the bottom dead point by inertia and the intake valve is opened; And
Wherein the piston is moved from the bottom dead center to the top dead center, and the exhaust valve is opened. The internal combustion engine according to claim 1, wherein the intake valve is opened during the expansion stroke to introduce cold air from the outside into the high-temperature cylinder, and the high-temperature air cooled inside the cylinder is opened to the outside by opening the exhaust valve during the compression stroke, Thereby improving the cooling performance. The intake valve according to claim 1, wherein the opening and closing of the exhaust valve in the exhaust stroke and the opening and closing of the intake valve in the intake stroke are continuously performed, and the opening and closing of the exhaust valve in the compression stroke, Wherein the opening and closing of the valve is discontinuous. An upper split bar slidable in a vertical direction;
A lower split bar located below the upper split bar and slidable in the up and down direction and defining an oil receiving portion between the upper split bar;
A main body in which the upper split bar and the lower split bar are slidably received, and an oil supply gallery for supplying oil to the oil receiving portion is formed at one end;
An oil chamber for supplying oil to the oil supply gallery;
A valve for supplying oil to the oil receiving portion through the oil supply gallery or for discharging oil from the oil receiving portion;
A cam mounted on a lower portion of the lower split bar to periodically move the upper split and lower split bars; And
And a rocker arm driven by up-and-down movement of the upper split bar to control opening and closing of the intake or exhaust valve. 5. The valve control apparatus according to claim 4, wherein a safety oil discharge gallery for discharging oil in the oil accommodating portion is formed at the other end of the main body when the size of the oil accommodating portion becomes a predetermined size or more. 5. The valve control apparatus according to claim 4, wherein the cam opens and closes the exhaust valve and the intake valve in the intake stroke and the exhaust stroke, and the valve opens and closes the exhaust valve and the intake valve in the compression stroke and the expansion stroke. 5. The exhaust gas recirculation system according to claim 4, wherein the cam is operated both during normal driving and during traveling, and the exhaust valve and the intake valve are continuously opened and closed, So that opening and closing of the valve occur discontinuously.
KR1020150120814A 2015-08-27 2015-08-27 Method for actuating valve for improving fuel efficiency in coasting and apparatus for controlling valve KR101568189B1 (en)

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KR1020150120814A KR101568189B1 (en) 2015-08-27 2015-08-27 Method for actuating valve for improving fuel efficiency in coasting and apparatus for controlling valve

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KR1020150120814A KR101568189B1 (en) 2015-08-27 2015-08-27 Method for actuating valve for improving fuel efficiency in coasting and apparatus for controlling valve

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007060853A1 (en) * 2005-11-24 2007-05-31 Toyota Jidosha Kabushiki Kaisha Hybrid vehicle
JP2008075569A (en) * 2006-09-21 2008-04-03 Toyota Motor Corp Control device for internal combustion engine
JP2013068099A (en) * 2011-09-20 2013-04-18 Hitachi Automotive Systems Ltd Control device of internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007060853A1 (en) * 2005-11-24 2007-05-31 Toyota Jidosha Kabushiki Kaisha Hybrid vehicle
JP2008075569A (en) * 2006-09-21 2008-04-03 Toyota Motor Corp Control device for internal combustion engine
JP2013068099A (en) * 2011-09-20 2013-04-18 Hitachi Automotive Systems Ltd Control device of internal combustion engine

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